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Rule:
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Sid: 1326
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Summary:
Secure Shell (SSH) is used to remotely manage systems over encrypted TCP
sessions. This event is generated when an attempt is made to exploit
vulnerable versions of the SSH daemon.
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Impact:
System compromize presenting the attacker with root privileges. Denial
of Service (DoS) on certain network devices.
--
Detailed Information:
A flaw in the CRC32 compensation attack detection code may result in
arbitrary code execution with the privileges of the user running the SSH
daemon (usually root).
Some Netscreen devices may suffer a Denial of Service.
Affected Systems:
OpenSSH versions prior to 2.2
Multiple Cisco network devices
Multiple Netscreen network devices
SSH Secure Communications prior to 1.2.31
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Attack Scenarios:
The attacker would need to send specially crafted large SSH packets to
cause the overflow and present the opportunity to write values to memory
locations.
Exploit scripts are available
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Ease of Attack:
Simple. Exploits are available.
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False Positives:
None Known
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False Negatives:
None Known
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Corrective Action:
Upgrade to the latest non-affected version of the software.
Apply the appropriate vendor supplied patches.
--
Contributors:
Original rule writer unknown
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
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Additional References:
CERT:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0144
http://www.kb.cert.org/vuls/id/945216
Securityfocus:
http://www.securityfocus.com/bid/2347
Analysis by David Dittrich:
http://staff.washington.edu/dittrich/misc/ssh-analysis.txt
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